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React equivalent of getElementsByTagName

I am trying to get this var li = ul.getElementsByTagName('li'); to work in React however it is returning null as I guess the dom hasn't fully loaded. so Im looking for the reacty way to do this or a...

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How can I use multiple refs for an array of elements with hooks?

As far as I understood I can use refs for a single element like this:const { useRef, useState, useEffect } = React; const App = () => { const elRef = useRef(); const [elWidth, setElWidth] =...

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Console prints modifed javascript object before it's modifed? [duplicate]

"use strict"; let OBJ = { users: [], ids: [], settings: { window_close: false, greet: "Type something here and enter." } }; let key; if ("foo" == "foo") { key = { name: "window_close", path: "settings"...

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What is considered a non-word character in regex? [duplicate]

Just in case the answer changes based on a language's interpretation of regex, let's focus on Javascript. In Javascript regex, \w is defined as a character class matching 'word' characters, or...

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How to know which category is clicked on a stacked bar chart in amcharts?

I have a stacked bar chart and assigned a click listener on it to know which item was clicked.series.columns.template.events.on("hit", function(ev) { console.log(ev.target); }, this); but in the...

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JavaScript Sequencer MIDI file timing resolution (PPQN)

I read a lot about MIDI resolution and studied some codes like Tone.js and heartbeat. But I don't understand why there are different Pulses Per Quarter Note (PPQN) values and what the effect it has on...

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trying to use an regex inside firebase .where() to fillter users but only get...

Basicly i am working on an whatsapp clone and i went into an problem when searching over the contacts of the current user.here's the first codethis._user.getContacts(this.el.inputSearchContacts.value);...

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undefined error converting an address into coordinates with Mapbox geocoder

I'm working with Mapbox geocoder services for the first time, and I was trying to get the coordinates (latitude and longitude) as result of address search and I did it, but when I try to insert this...

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Wait 5 seconds before executing next line

This function below doesn’t work like I want it to; being a JS novice I can’t figure out why.I need it to wait 5 seconds before checking whether the newState is -1.Currently, it doesn’t wait, it just...

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Can someone help me understand what this function on redraws and reflows is...

The JS code is meant to minimizethe number of redraws and reflows required. I'm quite new to the concept so i'm not to sure what the function is doing....specifically the for loop.(function() { var...

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Check if props contain string or SVG

I pass props to a component that can be either string or an SVG. I want to render it conditionally based on the type.This is what I tried:const ProjectIcon = ({icon}) => { // icon can be an SVG or...

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Looping HTML5 video flashes a black screen on loop

I have a 20 second HTML5 video that loops via jquery. But every time the video starts, a black screen flashes quickly and it's very jarring because it's supposed to blend in with a white background.I...

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Clustered leaflet markers with sum (not count) totals: how to get consistent...

I would like to modify the behavior of leaflet grouping feature to total on grouping and preserve a round red bubble shape dependent on value. My data contains columns:lon lat sales_ytdI would like to...

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Redirect to component in Angular based upon error status code

I am handling errors with four pieces...an http interceptor for server returned errors, a global error handler that builds upon the built-in Angular error handler. an error service that logs the errors...

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new tabs opened with the scroll wheel of a mouse do not have a window.opener...

If I use the left mouse button to click on an anchor tag with a target of _blankwindow.opener is defined. If I use the scroll wheel to click on that same anchor tag, however, window.opener is not...

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Easy way to replace all the number groups in a string with a modification to...

I have a string like this,Testing 123 with 255test account 3 with AG55Test result set The requirement is to convert it to something like,Testing <num>123</num> with...

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React hooks how to only execute side effect function only once if I need to...

Lets say I have the following component using react hooksconst Component = (props) => { [state1, setState1] = useState(); [state2, setState2] = useState(); useEffect(()=>{ // use state1 and...

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Is there a way to disable the download button in html5 video

How can i disable download button in html5 video? I don't understand how can i use controls controlsList="nodownload" here. Any scripts I've attempted to remove this don't have any effect. Is there a...

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Looping through pixels in an image

My project is to input an image into a canvas tag in an HTML page, and then loop through the pixels and RGBA values of the pixels. While looping through the red values,so every fourth value in the...

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How can I open a whatsapp chat from mobile webpage?

I am looking for a way to open whatsapp chat through a webpage opened in mobile browser. Like if a user opens my webpage using a smart device and clicks on a link, it should open the whatsapp chat...

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